i richards



Jan. 28, 1941. RlCHARDs 2,229,901

CALCULATING MACHINE Filed March 12, 1937 4 Sheets-Sheet 1 1 VIII] IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII/IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIll E O i 111/ 7a: m M77 1N VENTOR. 4/ber/ E/b/75F0 5 ATTORNEY.

Jan. 28, 1941. A. I. RICHARDS 2,229,901

CALCULATING MACHINE Filed March 12, 1957 4 SheetsQSheet 2 --I IE E INVENTOR. 4/ber/ Q'c/wras BY PM W %mh ATTORNEY.

1941- A. l. RICHARDS CALCULATING MACHINE 4 Sheets-Sheet 3 Filed March 12, 1937 INVENTOR. f/charos ATTORNEY.

Jan. 28, 1941. RlCHARDs 2,229,901

CALCULATING MACHINE Filed/March 12, 1957 4 Sheets-Sheet 4 IN VENTOR.

ATTORNEY.

Patented Jan. 28, 1941 UNITED STATES ATENE CALCULATING MACHENE ration oi California Application March 12, 1937, Serial No. 130,501

19 cums.

The present invention relates to calculating machines, and more particularly to improved means for controlling the sign character of the registration in the revolutions counter.

It is the general object of the invention to provide for selectively determining registration in the revolutions counter of a calculating machine in a single sense irrespective of changes in the sign character of registrations in the accumulator. 7

Another object of the invention is to provide .a calculating machine which is constructed to -facilitate the calculation of the gradients of roads, and other similar types of calculation.

Another object of the invention is to provide an improved revolution counter mechanism for calculating machines in which the sign character of the registration can be controlled to be like or unlike that of the registration, in the accumu- 20 iator, or which can be controlled independently of the character of registration in the accumulator.

Other objects will be noted from the following description of a preferred embodiment of the 25 invention, as illustrated in the accompanying drawings, in which:

Figure l is a fragmentary vertical longitudinal section through the rear part of the machine, and is taken in a plane indicated by the line 30 i-l in Figure 2. Certain of the parts are illustrated schematically.

Figure 2 is a sectional plan view of the rear part of the machine with the register carriage and the keyboard mechanism removed.

Figure 3 is a fragmentary enlarged view showing a part of the counter actuating mechanism in perspective.

Figure 4 is a fragmentary sectional view of a part of the counter mechanism, the view being 44) indicated by the line 4-4 in Fig. 1.

Figure 5 is a side elevational view of the revolutions counter control mechanism, as viewed from the right side of Fig. 2. In this view the parts are shown as positioned to determine posi- 45 tive registration in the revolutions counter irrespective of positive or negative registration in the accumulator.

Figure 6 is a fragmentary view of a part of the counter control mechanism and associated parts.

Figure '7 is a fragmentary elevational view,

similar to Fig. 5, but showing the parts as positioned to provide for registrations of opposite sign character in the counter and the accumulator.

55 Figure 8 is a View similar to Fig. 7, with the parts positioned to determine registrations of like sign character in the counter and the accumulator.

While my invention may be used in various types of calculating machines capable of performing the four cardinal rules of calculation, and in which the sign character of the registration in the revolutions counter can be controlled,

I prefer to employ my invention in connection with the type of machine disclosed in the cog0 pending applications of Carl M. F. Friden Serial No. 724,482, filed May 8, 1934, and Serial No. 66,381, flied February 29, 1936, which type of ma chine is commonly referred to as the Thomas type, and employs a shiftable accumulator, and 35 one-way" actuating mechanism for both the accumulator and the revolutions counter.

In the embodiment chosen for illustrative purposes, the calculating machine may include a. base It (Fig. 1) upon which side frame plates ii and It may be secured, and between which cross plates i3, i4, i5 and 56 may extend to support various parts or the selecting, actuating, and transfer mechanisms for both the accumulator and the revolutions counter; Cross plates 13 and I6 may also carry suitable rollers journalled thereon to support a register carriage l! in which both the accumulator and the revolutions counter are mounted for cndwise shifting movement relative to the frame and the actuating mechanlsm thereior, which are mounted in the frame.

The accumulator or product register comprises a series of ordinally spaced similar numeral wheels 2| (Fig. 1), each of which is carried by a vertical numeral wheel shaft 22 carrying a ten tooth bevel gear 23 at its lower end for cooperation with either of similar plus-humus gears 24, 25 formed at the ends of a. spool 26. Each spool 25 is slldably and non-rotatably mounted on a square shaft 21, which may be suitably mounted in the cross plates i3, i4 and iS-to carry parts of the transfer and selecting mechanisms. Between the plates l4 and i6, each shaft 21 carries a pair of ten-toothed gears 28 slidably and non-rotatably mounted thereon. Each 5 gear 28 is provided with a grooved hub which is engaged by the forked end 29 of a selecting slide 3|, two of which are provided in each order. The slides 3| extend toward the front of the machine for cooperation with an associated bank meral keys 32.

The numeral keys 32 may be suitably mounted for endwise sliding movement and at their lower ends have pins 33 for cooperation with differentially inclined cam surfaces 34 of the slides 3|, 5

of nu- II and i2.

' the counter actuator to a part of the keys of each bank being associated inder 36 (Fig. 1) which may carry two sets ofstepped teeth for cooperation with the respective gears 28. Two cylinders 36 for adjacent orders of the machine may be mounted on. the same actuating shaft 39 which is suitably journalled in cross plates is and 55. As seen in Fig. 2, the shafts 2'5 are equally spaced and each pair there= of associated with an actuating shaft 39 are spaced slightly to either side thereof.

At its forward and each actuating shaft 39 may be connected by a set of bevel gears 46 with a transversely extending drive shaft M which is suitably journalled by bearings $2 in the side plates ii and 52. side plate I? and may be associated with a cyclic clutch or with a cyclically operable hand crank, as may be desired.

The above described. arrangement is such, that upon one rotation of drive shaft ti, from one to nine increments of movement may be imparted to the shafts ill of the various orders in accordance with the positioningofthe gears 26 with respect to the stepped teeth of the cylinders 36 on the shafts 39. This difierential movement of the shafts Z'i' is transmitted to the numeral wheels 2! from. either gears 26 or gears 25 of the spools 26, whose position is controlled to determine whether the registration is positive or negative.

To control the meshing of the plus-minus gears 24 and 25 with numeral wheel gears 23, a transversely extending strap @6 (Figs. 1 and 2) extends beneath the spools 26 and between the sets of gears 26 and 25. Strap d6 may be carried for rocking movement by arms ll pinned on transverse shaft 46 suitably journalled in side plates Control shaft 66 (Figs. 2 and 5) extends beyond the side'plate l2 and carries an upright arm 69 which is connected by bolt 6| with a plus-minus slide 52 which extends forwardly of the machine as seen in Fig. 5, and is supported for endwise movement by arm 49 and by link 53. The endwise movement of plusminus slide 52 to move the plus-minus gears 24, 25 in either direction from their central inactive position shown in Fig. 1 may be effected by any suitable means, as, for example, the plus and minus keys shown in said application Serial No.

of numeralwheels 6i (Fig. 1), each of .whlch is.

carried by a shaft 62 suitably journalled in the carriage H. A numeral wheel 6| is provided for each ordinal position of the carriage and actu- 'ating means are associated therewith to introduce an increment of movement to the numeral wheel 6| aligned with the counter actuator as determined by the ordinal position of the carriage, while suitable transfer means is associated with effect the tens transfer in the higher orders. As described later; the counter actuating mechanism is constructed to effect both positive and negative registration on the numeral wheel 6| as controlled by'the sign Shaft ii projects beyond the .vided with a ten toothed gear 63 (Fig. 1) for cooperation with the actuating mechanism, which comprises a tooth 64 (Figs. 1 and 2) which is journalled on a shaft 66 for rocking movement thereabout, and for endwise movement therewith as will be explained. The tooth 64 is supported for two oscillatory movements, one of which is about its axis to move into the plane of the aligned gear 63, and the other of which is axial to effect the movement of the gear 63 for one increment. .By changing the phase relationship between the rotative and axial oscillations of the actuator tooth, the increment of movement can be imparted either positively or negatively thru the gear 63 to the associated numeral wheel 6| as will appear more clearly hereinafter.

The actuator unit for the revolutions counter as illustrated in Figs. 1 to 4 comprises the digitation actuator tooth 64, and a series of transfer teeth 66 which are formed on respective hubs 61 and 66 pivotally mounted in end to, end relation between end collars 69 pinned on the shaft 65. Each actuator tooth and its hub are similar except for the digitatlon actuator 64 and its hub 6'! which are at the right in Fig. 2 and comprise the lowest order. Each hub 68 has at its right end adjacent the lower order, an offset tooth Ii lying in the plane of the actuator tooth of next lower order and held in spaced relation therefrom by a lug 12. Each actuator tooth 64 and 66 is provided with a laterally extending arm 13 which lies under a rod it extending between frame yokes l6 integrally formed with the collars 69. Between the opposite ends of the yokes 16, a rod 11 is secured. and from which springs 18 extend to the apertured ears 19 of actuator teeth.

From the above description, it is seen that actuator tooth 64 and each. transfer tooth 66 are each urged in a clockwise direction as viewed in Fig. 1 by springs 18, but are restrained from movement by the engagement of their respective arms 16 beneath the rod I4. It follows, therefore, that the digitatlon actuator tooth 64 and the transfer actuator teeth 66 will be urged yieldably to active position upon clockwise movement of the framework comprising shaft 65, yokes I6 and rods 14 and 11, the means for producing such movement being described later. Tooth 64 is moved to active position for each rotative oscillation of shaft 65, its yleldable connection to rods I4 and I1 preventing jamming if tooth 64 should accidentally strike a tooth of the aligned gear 63.

Each transfer tooth 66, however, is held against movement to active position except when the numeral wheel 61 of next lower order passes from nine to zero or zero to nine and thereby determines the transfer of an increment. For this purpose, shaft 62 of each numeral wheel 6| carries a'disc 60 (Figs. 1 and 4) formed integrally on the hub of the associated gear 63, and which normally is engaged upon oscillation of shaft 65 by the control tooth ll of the transfer actuator 66 of next higher order. Each disc 66 is provided with a peripheral notch 66a, which, when the associated numeral wheel passes from nine to zero or zero to nine, moves into alignment with control tooth H so that such tooth can move into "the notch and its associated transfer tooth 66 can move into mesh with the aligned gear 63 and transmit the transferred increment thereto during the axial reciprocation of shaft 65 as described hereinafter.

Because of the overlapping relation of each control tooth H with the transfer tooth $8 of next lower order, each transfer tooth is also restrained against movement to active position until the next lower order tooth 56 moves to active position, thereby enforcing a successive transfer from the lowest to the highest order.

Means are provided for rocking the counter actuator frame back and forth about its axis in a timed relation with the operation of the accumulator actuating means, so that tooth 54- is movedv to and from active position during each cycle of operation ofthe machine. Shaft 85, which is both slidably and rotatably journalled by bearings 8| in the side plates II and 52, carries adjacent its left hand end, 9. depending arm 82 (Figs. 1 and 2) which at its lower end has a pin 83 projecting thru an aperture in side plate I i for engagement with the bifurcated upper end of a bell crank 8 pivoted at 85 (Fig. 1) on plate II. The other arm of the bell crank -84 carries a suitable pin or roller 86 which is engaged with a cam track 81 (Figs. 1 and 2) in a cam disc 88 secured on the end of the drive shaft 4!.'

Thus, upon each revolution of the drive shaft ll, the cam disc 88 oscillates the bellcrank Bl so that the actuator tooth. $4 is given a rotative oscillation in a timed relation to the operation of the accumulator actuating means.

As explained above, the actuator tooth 64 is also given an axial oscillation for eflecting the actuation of the gear 53 after the tooth has been brought into registery therewith by the rotative movement thereof. For this purpose, shaft 65 (Figs. 1 and 2) carries a square collar GI having downwardly projecting pin 92 engaging the bifurcated end of a lever 93 which is formed integrally with a yoke 91 mounted for vertical sliding movement in a pair of brackets on the side plate I2. Thus, oscillation of yoke 34 and lever 93 will efiect endwise movement of the shaft 55 and axial oscillation of the actuator tooth M.

It will be apparent that if. the tooth it is moved to active position before its endwlse movement, the associated numeral wheel 5i will be rotated in one direction, and that, conversely, if the actuator tooth B4 is moved to active position after its endwise movement in one direction, and before its return movement, the numeral wheel SI will be rotated in the opposite direction. This varying of the phase relationship oi the oscillatory movements of the actuator tooth is controlled by the-vertical positioning of the yoke 84, the pin 92 being of suflicient length to cooperate with the lever 93 in all positions of the yoke 94. The yoke 94 has an arm 81 (Figs. 1 and 2) at its lower end opposite an arm of the lever 83. Lever 33 and arm 91 carry respective pins 98 and 89 which are disposed on opposite sides of a cam drum III for cooperation with the respective cam grooves in! and Ill thereof.

The cam grooves I02 and I03 are similar, except' that they are rotatively displaced about the drum IIII so that oscillation of the yoke 84 will occur at diiierent times in the cycle of revolution of the actuating means in accordance with the engagement of pin 99 with groove ll! as shown in Fig. 1, or the engagement of pin $8 with the groove I03, if the yoke is moved downwardly from the position shown in Fig. '1. The diflerence in timing provided between grooves I02.

I03, effects the initial endwise movement of by rocking about its axis. In this waythe sign character of the registration on the numeral wheel @I may be reversed.

The position of the yoke 84 is controlled normally by the setting of the plus-minim gears with respect to the accumulator to determine either positive or negative registration. For carrying out this control, the yoke 94 is provided with an annular groove iii (Fig. l) which is engaged by a pin it! (Figs. 1, 2 and o) carried by an am It! secured on a rock shaft its journalled in the side plate i2 and a supporting plate HI suitably mounted in spaced relation from the plate I2. Exteriorly of the plate iii, shaft HI! (Figs. 2 and 55) carries a three arm lever H2 having upper and lower bifurcated arms H3 and 1H, and horizontal centralizing arm 6. The end of arm Hi is recessed for engagement by a roller ill carried by centralizing lever Ill pivotally mounted on a stud M0 on the plate III, and urged to active position by a spring I29.

The bifurcated arms H3 and Ho (Fig. 5) are adapted for engagement by respective pins iii and 22 carried at the forked front end oi a con trol arm I23 pivotally secured at are to the rear and of plus minus slide 52. It will be re called that slide 52 is moved endwise in one or the other direction from its central neutral position shown in Fig. 5 to control selectively positive or negative registration in the accumulator. Thus, the lever H2 will be rocked upon movement of the plus-minus slide b2, and because pins iii and 522 can be operatively engaged with lever H2 selectively on opposite sides oi the pivoral axis thereoi, the direction of the oscillation of the lever H? can be reversed for a selected directional movement of the plus-minus slide 52. In this manner the sign character of the registration in the revolutions counter can be reversed with respect to the sign character of the registration in the accumulator, so that either a multiplier or quotient can be registered in true figures, or complements. Normally, the control arm i2! is urged to the position shown in Fig. ll bya spring 425 connected between arm 823 and plate iii. In this position oi the parts, the revolutions counter will register with the same sign character as the accumulator.

A manual 7/ control is provided for determining the position of the control arm I23 with respect to the lever I so that either true figure or complementary results can be obtained in the revolutions counter, and in addition, the control can be set so that the revolutions counter will always register with the same sign character irrespective of the sign character of the registratlon in the accumulator. This latter setting is especially useful in problems where the total number of registrations in the accumulator is desired irrespective of whether they are positive or negative, as, for example, in calculating gradlents in highway construction.

Control lever I30 (Figs. 5, 7 and 8) is pivotally mounted by stud II! on control plate III, and has a bent and oflset lower end I32 provided with an end surface I33 beneath the pin III, and also provided with a pin I overlying an arm I pivoted at 531 on plate III. The free end of arm Ill has pivotally connected thereto at I a link ill, which is also pivotally connected at III with .a cam lever Ill. Lever lllis' pivoted by a stud I on plate Hi and has its lower arm connected by spring I with a suitable stud on plate llI,.so that the cam lever I4! is normally urged in a counterclockwise direction to the position shown in Fig. 5, where its lower arm engages a stop pin' I it on plate III.

The control lever I30 can be adjusted to any one of the three positions illustrated in Figs. 5, 7 and 8, respectively, and is resiliently latched in any such position by means of latch lever II- pivengaged arm I36 and carried it downwardly to effect a similar movement of the cam lever I62 thru link I39, against the tension of spring I. Thus, cam lever M2 is moved to and held in inactive position and pin IZI remains engaged with arm I I3 under the influence of the spring iZEi.

If the lever I3!) is moved to its extreme left hand position as shown in Fig. 7, end surface I33 thereof engages the pin :12! to move arm I23 upwardly and engage pin 822 with arm IM. In this condition of the parts, the sign character oi the registration in the revolutions counter will be opposite to that in the accumulator, so that quotients or complementary multipliers will be registered.

If the control lever are is moved to its central position as illustrated in. Fig. 5, pin iii remains engaged with arm I I3 while carn lever M2 is held in active position by its spring, where its upper end abuts pin I22. With the parts positioned as described and as shown in Fig. 5, movement of plus-minus slide 52 toward the rear of the machine operates, through arm 8% and pin IN, to rock control lever H2 in a, clockwise direction and thereby determine positive registration on the revolutions counter. Ii plus-minus slide 52 is moved forwardly of the machine, pin I22 rides on the end surface of cam lever I42 and moves upwardly into engagement with arm H4, while pin I is at the same time moved out of engagement with arm H3. The forward movement of arm I23 and pin I22 also serves to effect clockwise oscillation of control lever i I 2, so that with control lever in its central position control lever III is operated in the same manner and positive registration in the counter will take place, irre-= spective of the direction of movement or the plus- 'minus slide.

Therefore, in this condition the revolution counter serves to count the total number ofregistrations without relation to their sign character.

As noted above, this type of operation is particularly useful incalculation of road gradients, where one factor, distance, increases constantly whether or not the road gradient is positive or negative.

While Ihave shown and described my invention in connection with a preferred construction, it is to be understood that the construction can be modified and varied'within the scope of my invention as defined in the appended claims.

I, therefore, claim as my invention:

1. In a calculating machine, a reversible accumulator, uni-directionally operable actuating means therefor, settable plus-minus gears between said actuating means and said accumulator for controlling the sign character of registration mi'nus gears over said counter registration sign character controlling means, and having a position for controlling said last named means to cause registration of a constant sign character on said counter in any active position of said settable gears.

2. In a calculating machine having an accumuating means therefor; settable means for determining positlve or negative'registration on said accumulator, means responsive to movement of .said settable means for controlling positive and negative registration on said counter, and means including a manipulable control member settable to a position for controlling said responsive means to cause registration of one sign character only on said counter irrespective of the setting of said settable means to cause positive or negative registration on said accumulator.

3. 1m a calculating machine having an accumulator, a revolutions counter, and respective actuating means therefor; a plus-minus control memleer movable in opposite directions from a neutral position to control the sign character of the registration on said accumulator, plus-minus control means for said counter controlled by said control member and normally effective to change the sign character of the registration on said counter in response to changes in the sign character of the registration on said accumulator, and a ma.-

nipulable control mechanism settable to a position for controlling said plus-minus means to cause registration of one sign character only on said counter irrespective. of the direction of movement of said plus-minus control member.

4;. In a calculating machine having an accumulator, a revolutions counter, and respective actuating means therefor; a slide mounted for endlater, a revolutions counter, and respective actuwise movement in either direction to control the sign character of the registration on said accumulator, a lever pivotally mounted intermediate its ends and oscillatable in either direction to control the sign character of the registration on said counter, a connecting link movable to connect said slide to either arm of said lever, and means for determining movement of said link to connect said slide to one arm of said lever on movement of said slide in one direction and to the other arm of said lever on movement of said slide in the other direction, including a. camfor controlling movement of said link to connect said slide with said one arm.

5. In a calculating machine having an accumulator, a revolutions counter, and respective actuating means therefor; a slide mounted for endwise movement in either direction to control the sign character of the registration on said accumulator, a lever pivotally mounted intermediate its ends and osclllatable in either direction to control the sign character of the registration on said counter, a connecting link movable to connect said slide to either arm of said lever, spring means urging said link into engagement with one of said arms, and a cam settable to determine movement of said link to provide for connection of r effecting engagement oi.

' said one arm,

said slide to one arm or said lever on movement of said slide in one direction and to allow connection of said slide to the other arm of said lever under the influence of said spring means on movement of said slide in the other direction,

6. In a calculating machine having an accumulator, a revolutions counter, and respective actuating means therefor; a slide mounted for endwise movement in either direction to control the sign character of the registration on said ac'cumulator, a lever pivotally mounted intermediate its ends and oscillatable in either direction to control the sign character of the registration on said counter, a connecting link movable to connect said slide to either arm of said lever, means for determining movement of said link to connect said slide to one arm or said lever on movement of said slide in one direction and to the other arm of said lever on movement of said slide in the other direction including a cam for controlling movement of 'said link to connect said slide with and a manipulaole control memher for selectively adjusting said link and said cam.

7. In a calculating machine having an accumulater, a revolutions counter, and respective ac= tuating means therefor; a slide mounted for endwise movement in either direction to control the sign character of the registration on said accumulator, a lever pivotally mounted intermediate its ends and oscillatable in either direction to control the sign character oi the registration on said counter, a connecting link movable to con neot said slide to either arm of said lever, spring means urging said link into engagement with one of said arms, a cam settable to determine movement of said link to allow connection of said slide to onearm of said lever under the influence of said spring means on movement of said slide in one direction and to provide for connection of said slide to the other arm oi said lever on movement of said slide in the other direction, and a manipulahle control member for selectively ad justing said link and said said control mem her having a position to determine connection. of said link to one of said lever arms said cam inactive, a position to determine connection of said link to the other of said lever arms said cam inactive, and a position i which cam is active,

8. In a calculating machine having an accumulator, a revolutions counter, and respectiveactuating means therefor, a slide mounted for endwise movement in either direction to control the sign character of the registration on said accumulator, a lever pivotally mounted intermediate its ends and oscilla'table in either dlrection to control the sign character of theregir tration on said counter, a connecting link movable to connect said slide to either arm of said lever, spring means urging said link into engage= ment with one of said arms, a manually set-table control member associated with said link having a plurality or adjustments for determining control of said lever from said slide, and a cam mounted for movement to and from active position under control oI-said control member for said link with the other of said arms, one setting of said control member providing for engagement of said link with said one arm during movement of said slide in one direction and iorv placing said cam in active posh tion, whereby upon movement of said slide in the other direction said cam becomes effective to engage said link with said other arm.

9. In a calculating machine having an aclever, and control means associated with said link ior determining connection thereof to one arm 0! said lever upon movement of said slide in one direction and for determining connection of said link to the other arm of said lever upon movement or said slide in the other direction.

i i, In a calculating machine, an accumulator, accumulator actuating means, settahle means for controlling the sign character of registrations on i said accumulator, a revolutions counter, counter actuating means, adjustable means for control ling the sign character of registrations on said counter, connecting means from said settable means to said adjustable means whereby the sign character of a registration can be lilreor unlike the sign character of the corresponding registration on said accumulator, and manipulable control means for setting said connecting means to determine operation thereof to provide registration of a single sign character on said counter irrespective of the sign character of the registration on said accumulator.

11. In a calculating machine, an accumulator, accumulator actuating means, sctta'hle means for controlling the sign character of registration on said accumulator including a member movable between aplus position and a minus position,

a revolutions counter, counter actuating means,

on said counter iii 12, In a calculating machine, an accumulator,

accumulator actuating means, means including a slide movable in either direction from a central position to control the sign character of registrations on said accumulator, a revolutions counter, counter actuating means, means including a lever pivotally mounted intermediate its ends and oscillatalblc in either direction from a central position to control the sign character of aregistration on said counter, mean-s including a link for connecting said slide to either am of said lever, spring means yieldalcly urging said link into engagement with one aim of said lever, and adjusting means associated with said lint: including a cam settable to effect engagement of said link; with the other arm oi said lever upon movement or said slide in one direction from its central position.

13. In a calculating machine, an accumulator,

accumulator actuating means, settable means said settable means for simultaneous movement, whereby movement or one of said settable means controls the movement of said other settable means, spring means yieldably urging said reversible connecting means into one adjusted position thereof, and adjusting means for reversing the operation of said connecting means upon movement of said one settable means in one direction from its central position.

14. In a calculating machine, an accumulator for receiving both positive and negative registrations, a revolutions counter for receiving both positive and negative registrations, respective actuating means for said accumulator and said counter, settable means for controlling positive and negative registrations on said accumulator, adjustable means for controlling positive and negative registrations on said counter, means for efiecting adjustment of said adjustable means in accordance with the setting of said settable means so that like or unlike registrations will be entered in said accumulator and said counter,

and manipulable control means cooperatively related to said adjustment effecting means for disa-bling the normal adjustment thereof in accordance with the setting of said settable means to cause one kind of registration only in said counter for both positive and negative registrations in said accumulator.

15. In a calculating machine, an accumulator, a revolutions counter, respective actuating means for said accumulator and said counter, settable means for controlling the-sign character of registrations on said accumulator, settable means for controlling the sign character of registrations on said counter, common means for operating said settable means, means for causing setting of said counter controlling means reversely with respect to the setting of said accumulator controlling means, and means for disabling said last-named means to cause registration of a single sign character on said counter irrespective or the sign character of registrations on said accumulator.

16, In a calculating machine having an accumulator, a revolutions counter, and respective actuating means therefor; a' plus-minus control member movable in opposite directions from a neutral position to control the sign character of registrations on said accumulator, plus-minus control means for said counter settable to cause both positive and negative registrations thereon, means adjusted by said control member to set said plus-minus control means and cause changes in the sign character of the registration on said counter in response to changes in the sign character of the registration on said accumulator, and

control mechanism settable selectively to disable the adjustment of said last-named means by said control member and to cause registration of a single sign character only on said counter irrespective oi the sign character of registrations on said accumulator.

2.7. In a calculating machine having an ac cumulator, a revolutions counter, and respective actuating means therefor; settable means for causing either positive or negative registrations on said accumulator, adjustable means for causing either positive or negative registrations on said counter, and control mechanism for effecting adjustment of said adjustable means, said control mechanism including a manually 'settable control memberhaving one position to adjust said adjustable means to cause like registrations on said accumulator and said counter, a second position to adjust said adjustable means to cause unlike registrations on said accumulator and said counter, and a third position to adjust said adjustable means to cause registrations of a single sign character on said counter irrespective of the sign character of registrations on said accumulato'r.

18. In a calculating machine an accumulator, accumulator operating and control means for efiecting both positive and negative registrations thereon, a revolutions counter, counter operating and control means for efiecting both positive and negative registrations on said counter, means operated by said accumulator operating and control means for causing the sign character of registrations on said counter by said counter operating and control means to change in response to changes in the sign character of the corresponding registrations on said accumulator, and settable means having'a normally inactive relation to said counter operating and control means and settable to active position to control said operated means to cause registrations of a single sign character on said counter irrespective of the sign character of corresponding registrations on said accumulator.

' thereon, a revolutions counter, counter operating and control means for effecting positive and negative registrations on said counter, means operated by said accumulator operating and control means for causing the sign character of registrations on said counter by said counter operating and control means to change in response to changes in the sign character of the corresponding registrations on said accumulator, said counter operating and control means including a manually,settable control member therefor having three positions of adjustment, said control member in one of said positions causing like registrations on said counter and said accumulator and in a second of said positions causing unlike registrations on said counter and said accumulator. and means brought into play by said member in the third position of adjustment thereof for varying the action of said counter actor on said counter irrespective of changes in the sign character of registrations on said accumulator.

ALBERT I. RICHARDS. 

